JPH0366418A - Bending method for aluminum material - Google Patents

Abstract

PURPOSE:To obtain the bending product of good quality by supplying an aluminum material for bending after surface treatment that a lubricative film is previously brought to form on the surface of work consisting of aluminum material is performed by use of a bending machine with a movable gyrodie ahead of a fixed die. CONSTITUTION:A guiding hole 4 for work of the fixed die is composed of a group 5 of guide rollers enclosing the circumference of work and a mouth piece 6 which is made of a hot tool steel, carbon or ceramics, etc. is mounted on the tip part on the outlet side. A movable gyrodie 3 is mounted on the mounting frame 8 for gyrodie which is movable vertically and horizontally and is three-dimensionally turning and displacing operated. The surface treatment is applied to the work 10 and the lubricative film of ananodal oxidized film or the composite film of anodal oxidized film and electrodeposition coating film is previously formed. By this way, seizure to the die, gnawing and the like aren't generated and the bending product of good quality and without flaws on the surface is obtained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for bending aluminum materials, and in particular to a method for bending aluminum materials, in particular, using an extruded aluminum material as a workpiece, and using a fixed mold and a movable gyro mold correspondingly arranged in front of the workpiece. The present invention relates to a bending method when bending is performed using a bending machine having the present invention.

Conventional technology When bending long aluminum materials used for building materials, machine parts, automobile parts, etc., especially aluminum extrusion materials, into two or three dimensions, fixed molds such as those commonly called multi-benders are used. When processing using a bending machine equipped with a movable gyro mold and a movable gyro mold, the bending process mainly utilizes the compression bending principle of bending while pushing the workpiece, so the bending process is performed using the principle of compression bending, which bends the workpiece while pushing it. These days, such bending methods tend to be used favorably because they are advantageous in that they can be relatively small and produce bent products with fewer material defects and surface defects.

Problems to be Solved by the Invention However, when bending an aluminum material using the multi-bender described above, especially when continuous bending is performed for a long time, the phenomenon of seizure and galling of the workpiece against the mold occurs. As a result, a situation occurs in which flaws occur in the workpiece, and smooth bending is often obstructed.

Conventionally, attempts have been made to improve this by subjecting the mold to surface treatment such as chrome plating to improve slipperiness, but if the workpiece is made of aluminum in particular, The phenomenon was still not preventable. On the other hand, applying a lubricant to the workpiece before bending is also practiced, and although this has been confirmed to be quite effective, it is still insufficient to prevent seizures etc. Due to the problem of environmental pollution,
It wasn't necessarily a good thing.

An object of the present invention is to provide a bending method that can solve the above-mentioned problems.

Means for Solving the Problems As a result of various experiments and research aimed at solving the above-mentioned problems, the inventors of the present invention have developed a method for bending a workpiece made of aluminum with a predetermined surface treatment applied to the surface of the workpiece. When used, there is no galling or seizure with the mold, and there are almost no harmful defects on the surface of the workpiece.
By performing smooth bending, he discovered scales and completed this invention.

Accordingly, the present invention uses a bending machine having a movable gyro mold that can be turned and displaced in three-dimensional directions in front of a fixed mold having a workpiece through hole, and both metal molds are bent by the operation of the gyro mold. When performing a prescribed bending process on a workpiece that is sequentially forced through a die, the workpiece made of aluminum is subjected to a surface treatment to form a lubricating film on its surface before being subjected to the above bending process. The gist of this paper is a method for bending aluminum materials.

The type of surface treatment described above is not particularly limited, and any type of surface treatment may be used as long as it can provide a lubricating film to the surface of the aluminum workpiece. Suitably, for example, anodized film treatment,
Alternatively, a composite coating treatment in which an electrodeposition coating film is formed on an anodic oxide film can be mentioned.

The aluminum material of the workpiece is mainly an aluminum extrusion molded material, and those made of various aluminum materials or aluminum alloy materials ranging from A1000 series to 7000 series are used.

Function: The film formed on the surface of the aluminum workpiece prevents the workpiece from adhering to the bending die due to its self-lubricating properties, and prevents seizure and galling.

Embodiment In the illustrated embodiment, (1) is a bending machine of a type generally called a multi-venter, which includes a fixed mold (2),
It has a movable gyro mold (3) correspondingly arranged in front of it.

There are various types of fixed molds (2), but in the illustrated embodiment, the fixed mold (2) is made of a large number of molds arranged so that a central workpiece conduction hole (4) surrounds the workpiece (10). It is composed of a group of guide rollers (5), and a mouthpiece (6) made of hot work tool steel such as SKD steel, carbon, or ceramics is attached to the tip on the exit side.

On the other hand, the movable gyro mold (3) is mounted on a gyro mold mounting frame (8) that is movable up and down and left and right, and is disposed in front of the fixed mold (2). This gyro mold (3) is three-dimensionally turned and displaced using the gyro principle, and by operating it three-dimensionally, both molds (2), (3) ) The workpiece (10), which is forcibly pressed and moved in the direction of the arrow in Fig. 1, through the workpiece conduction holes (4) and (9) of This gives a certain bending effect. Furthermore, by moving the gyro mold (3) back and forth and changing the distance between it and the fixed mold (2), the workpiece (l) is moved by the movement of the gyro mold (3).
It is possible to adjust the magnitude of the bending moment applied to O).

When a workpiece (10) made of a long aluminum material is subjected to a predetermined bending process using the above-mentioned bending machine, the workpiece is subjected to a predetermined surface treatment in advance, and the surface thereof is coated with an anodic oxide film or the like. A lubricating film, such as a composite film of electrodeposition coating and electrocoating film, shall be formed. The thickness of this film is not particularly limited, but is 2 to 9 μm.
By keeping it within the range of about m, the desired good self-lubricating effect can be achieved to prevent seizure and galling of the mold, while reducing the chance of cracking of the film due to bending. sell.

To bend the workpiece (10), it is transferred to the movable gyro mold (3) via the workpiece conduction hole (4) of the fixed mold (2).
By moving the workpiece forward while forcibly pushing it into the workpiece through-hole (9), bending is applied two-dimensionally or three-dimensionally by the turning displacement operation of the gyro mold (3). At this time, the surface film of the workpiece (10) exerts a lubricating effect on the workpiece (10) with respect to the molds (2) and (3), and even if the mold temperature rises somewhat due to continuous bending, To prevent the workpiece (10) from seizing or galling against the molds (2) and (3). However, during bending, the mechanical properties of the workpiece (10) and the physical properties of the coating are different, so generally speaking, as the radius of curvature of the bending becomes smaller, the expansion and contraction of the coating will be reduced by the main body of the workpiece (10). However, when using the above-mentioned bending machine, the workpiece (10) is bent by the gyro mold (3) while being pushed from the fixed mold (2) side. As a result, the partial elongation and contraction of the workpiece can be kept relatively small compared to when using other general bending machines, and as a result, the occurrence of film cracking is suppressed and the surface Bending can be performed in a state where fewer defects occur.

Effects of the Invention According to the present invention, as described above, bending of a workpiece made of an aluminum material is prevented by the self-lubricating action of a lubricating film formed in advance on the surface of the workpiece, thereby preventing seizure on the mold.
The bending process can be carried out smoothly without causing galling, and a high-quality bent product with no surface flaws can be obtained.

Of course, since such bending is performed without using a separate lubricant or the like, the work environment will not be contaminated.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention. (1)...Bending machine, (2)...Fixed mold, (3
)... Gyro mold, (10)... Work. Above is Lu Figure 1

Claims (1)

[Claims] A bending machine has a movable gyro mold that can be turned and displaced in three dimensions in front of a fixed mold having a workpiece conduction hole, and both molds are sequentially forced to conduct by the operation of the gyro mold. A method for bending an aluminum material, characterized in that when a workpiece made of aluminum is subjected to a predetermined bending process, the workpiece made of aluminum is subjected to a surface treatment to form a lubricating film in advance, and then subjected to the bending process. .